Unity3D的几种坐标系

1、 World Space（世界坐标）：我们在场景中添加物体（如：Cube），他们都是以世界坐标显示在场景中的。transform.position可以获得该位置坐标。该文章出自【狗刨学习网】Screen Space（屏幕坐标，鼠标坐标）:以像素来定义的，以屏幕的左下角为（0，0）点，右上角为（Screen.width，Screen.height），Z的位置是以相机的世界单位来衡量的。注：鼠标位置坐标属于屏幕坐标，Input.mousePosition可以获得该位置坐标，手指触摸屏幕也为屏幕坐标，Input.GetTouch(0).position可以获得单个手指触摸屏幕坐标。ViewPort

2、Space（视口坐标）:视口坐标是标准的和相对于相机的。相机的左下角为（0，0）点，右上角为（1，1）点，Z的位置是以相机的世界单位来衡量的。（用的不多，反正我暂时没有用到呵呵）绘制GUI界面的坐标系：这个坐标系与屏幕坐标系相似，不同的是该坐标系以屏幕的左上角为（0，0）点，右下角为（Screen.width，Screen.height）。 LineRender坐标：以屏幕中心为原点，向上向右增加。世界坐标屏幕坐标：camera.WorldToScreenPoint(transform.position);这样可以将世界坐标转换为屏幕坐标。其中camera为场景中的camera对象。屏幕坐标视

3、口坐标：camera.ScreenToViewportPoint(Input.GetTouch(0).position);这样可以将屏幕坐标转换为视口坐标。其中camera为场景中的camera对象。视口坐标屏幕坐标：camera.ViewportToScreenPoint(); 视口坐标世界坐标：camera.ViewportToWorldPoint(); 案例1在鼠标点击的位置上绘制一张图片出来（关于绘制GUI界面坐标系与屏幕坐标系之间的关系）。1. using UnityEngine;2. using System.Collections;3.4. public class Screen

4、ToGUI : MonoBehaviour 5.6. / Use this for initialization7. void Start () 8. 9. 10. 11. / Update is called once per frame12. void Update () 13. 14. 15. 16. /图片17. public Texture img; 18. /储存鼠标的位置坐标 19. private Vector2 pos;20. void OnGUI()21. 22. /鼠标左击，获取当前鼠标的位置 23. if (Input.GetMouseButton(0)24. 25.

5、pos = Input.mousePosition; /屏幕坐标26. 27. /绘制图片，屏幕坐标和GUI界面坐标只在Y轴上方向相反，只要被Screen.height减就可以互相转换。 28. GUI.DrawTexture(new Rect(pos.x, Screen.height - pos.y, 100, 100), img);29. 30.31. 复制代码 案例2角色头顶的名字（世界坐标转GUI界面坐标）先世界坐标转屏幕坐标，再屏幕坐标转GUI界面坐标代码如下：1. using UnityEngine;2. using System.Collections;3.4. public c

6、lass Blood : MonoBehaviour 5. public static float ScaleWidht = 0f;6. public static float ScaleHeight = 0f;7. private Rect _drawRect = new Rect();8. public float Width = 0f;9. public float Height = 10f;10. public const float DesignStageWidth = 800;11. public const float DesignStageHeight = 480;12.13.

7、 public Vector2 pos2;14. public float size_z;15. / Use this for initialization16. void Start () 17. ScaleWidht = Screen.width / DesignStageWidth;18. ScaleHeight = Screen.height / DesignStageHeight;19. Height = 2f;20.21. size_z = transform.gameObject.collider.bounds.size.z;22. 23.24.25. / Update is c

8、alled once per frame26. void Update () 27. /世界坐标转换到屏幕坐标28. print(transform.forward);29. pos2 = Camera.main.WorldToScreenPoint(transform.position + transform.forward * (size_z / 2);30. /计算角色头顶坐标31. pos2 = new Vector2(pos2.x, Screen.height- pos2.y - Height);32.33.34.35. /Vector3 worldPosition = new Ve

9、ctor3(transform.position.x, transform.position.y + Height, transform.position.z);36. /worldPosition = Camera.mainCamera.WorldToScreenPoint(worldPosition);37. /_drawRect = new Rect(worldPosition.x - 100 * ScaleWidht) / ScaleWidht, (Screen.height - worldPosition.y - 50 * ScaleHeight) / ScaleHeight, 20

10、0, 50);38. 39.40. void OnGUI()41. 42. /GUILayout.BeginArea(_drawRect);43. / GUILayout.Label(=哈哈=);44. /GUILayout.EndArea();45.46. GUI.Label(new Rect(pos2.x, pos2.y, 100, 50), =BETTER=);47. 48. 复制代码 案例3类似屏幕解锁功能的实现（屏幕坐标转换为世界坐标） 首先是创建LineRenderer。GameObject - Create Empty -更名为“LineRendererObj”，给LineRen

11、dererObj添加“Line Renderer”组件，Component -Effects -Line Renderer;将它的Positions 的size 设置为0 接下来是代码touch.CS：1.2. using UnityEngine;3. using System.Collections;4. using System.Collections.Generic;5.6. public class touch : MonoBehaviour 7. private Event e;8.9. public Texture2D Point;10. public Color c1 = Col

12、or.yellow;11. public Color c2 = Color.red;12. public int lengthOfLineRenderer;13. public GameObject LineRendererPrefab;14.15. private LineRenderer lineRenderer;16. / 17. / 保存创建的Line Renderer18. / 19. private List lineRendArray =new List();20.21. private Vector3 screenPoint;22. private Vector3 scanPo

13、s;23.24. private Color color;25.26. / 27. / 记录宫格所在GUI位置28. / 29. public List AreaRect = new List();30. / 31. / 记录宫格中心点32. / 33. public List CenterPointList = new List();34. / 35. / 宫格标签36. / 37. public int RectFlag;38. / 39. / 记录正确的滑动顺序40. / 41. public List KeyOrder = new List();42. / 43. / 记录玩家滑动顺序

14、44. / 45. public List PlayerKeyOrder = new List();46.47. / 48. / 判断开始鼠标位置是否可画49. / 50. public bool CheckStartRect=false;51.52. / 53. / 判断结束鼠标位置是否可画54. / 55. public bool CheckEndRect = false;56.57. / 58. / 行数59. / 60. public int Row = 4;61. / 62. / 列数63. / 64. public int Column = 4;65.66. void Start(

15、)67. 68. e = Event.current;69.70. scanPos = LineRendererPrefab.transform.position;71. lineRenderer = (LineRenderer)LineRendererPrefab.GetComponent(LineRenderer);72. lineRenderer.material = new Material(Shader.Find(Particles/Additive);73. lengthOfLineRenderer = 0;74. lineRenderer.SetColors(c1, c2);75

16、. lineRenderer.SetWidth(0.7F, 0.7F);76. lineRenderer.SetVertexCount(0);77.78. color = new Color8;79. color0 = Color.yellow;80. color1 = Color.blue;81. color2 = Color.cyan;82. color3 = Color.gray;83. color4 = Color.green;84. color5 = Color.grey;85. color6 = Color.magenta;86. color7 = Color.red;87.88.

17、 for (int RowCount = 0; RowCount Row; RowCount+)89. 90. for (int columnCount = 0; columnCount Column; columnCount+)91. 92. Rect IconRect = new Rect(columnCount * Screen.width / Column + Screen.width / Column / 2 - Point.width / 2, RowCount * Screen.height / Row + Screen.height / Row / 2 - Point.heig

18、ht / 2, Point.width, Point.height);93. AreaRect.Add(IconRect);94.95. Vector2 CenterP = IconRect.center;/得到每个的中心点96. CenterPointList.Add(CenterP);97. 98. 99. 100.101. void OnGUI()102. 103. e = Event.current;104. for (int RowCount = 0; RowCount Row; RowCount+)105. 106. for (int columnCount = 0; column

19、Count Column; columnCount+)107. 108. Rect IconRect = new Rect(columnCount * Screen.width / Column + Screen.width / Column / 2 - Point.width / 2, RowCount * Screen.height / Row + Screen.height / Row / 2 - Point.height / 2, Point.width, Point.height);109. GUI.Label(IconRect, Point);110. 111. 112. 113.

20、114. void Update()115. 116. if (e != null)117. 118. if (e.type = EventType.MouseDown)119. 120. for (int i = 0; i AreaRect.Count; i+)121. 122. if (AreaRecti.Contains(new Vector3(Input.mousePosition.x, Screen.height - Input.mousePosition.y, Input.mousePosition.z)123. 124. CheckStartRect = true;125. pr

21、int(Contains);126. PlayerKeyOrder.Add(i);127. RectFlag = i;128. break;129. 130. else131. 132. CheckStartRect = false;133. 134. 135.136. if (CheckStartRect)137. 138. print(MouseDown_);139.140. /Vector3 curPosition = mousePToLineRendererP();141. Vector3 curPosition = centerPToLineRendererP(RectFlag);1

22、42. GameObject newObj;143. newObj = (GameObject)Instantiate(LineRendererPrefab, LineRendererPrefab.transform.position, LineRendererPrefab.transform.rotation);144. lineRenderer = (LineRenderer)newObj.GetComponent(LineRenderer);145.146. int n = Random.Range(1, 8);147. c1 = colorn - 1;148. n = Random.R

23、ange(1, 8);149. c2 = colorn - 1;150. lineRenderer.SetColors(c1, c2);151.152. lineRenderer.SetVertexCount(1);153. lineRenderer.SetWidth(0.7F, 0.7F);154. lineRenderer.SetPosition(0, curPosition);155. lineRendArray.Add(lineRenderer);156. lengthOfLineRenderer+;157. 158. 159.160. if (e.type = EventType.M

24、ouseDrag&CheckStartRect)161. 162. print(MouseDrag_);163. Vector3 curPosition = mousePToLineRendererP();164. DrawRenderLine(lineRendArraylengthOfLineRenderer - 1, curPosition);165. 166.167. if (e.type = EventType.MouseUp & CheckStartRect)168. 169. for (int i = 0; i AreaRect.Count; i+)170. 171. if (Ar

25、eaRecti.Contains(new Vector3(Input.mousePosition.x, Screen.height - Input.mousePosition.y, Input.mousePosition.z)172. 173. CheckEndRect = true;174. PlayerKeyOrder.Add(i);175. RectFlag = i;176. print(EndContains);177. break;178. 179. else180. 181. CheckEndRect = false;182. 183. 184.185. if (CheckEndR

26、ect)186. 187. Vector3 curPosition = centerPToLineRendererP(RectFlag);188. DrawRenderLine(lineRendArraylengthOfLineRenderer - 1, curPosition);189. 190. else191. 192. PlayerKeyOrder.RemoveAt(PlayerKeyOrder.Count - 1);193. Destroy(lineRendArraylengthOfLineRenderer - 1.gameObject);194. /lengthOfLineRend

27、erer-;195. 196.197. 198. 199. 200.201. void DrawRenderLine(LineRenderer line, Vector3 vect3)202. 203. Vector3 newPos = vect3;204. line.SetVertexCount(2);205.206. line.SetPosition(1, newPos);207. print(new point: + newPos);208. 209.210. /public Vector2 RectCenterPoint(Rect AreaRect) /计算一个Rect的中心点211.

28、 /212. / Vector2 CenterPoint=Vector2.zero;213. / print(Rect:+AreaRect);214. / CenterPoint.x=AreaRect.xMin+AreaRect.width/2;215. 216. / CenterPoint.y=AreaRect.yMin+AreaRect.height/2;217. / print(CenterPoint:+CenterPoint);218. / return CenterPoint;219. /220.221. / 222. / 鼠标所在位置转换为LineRenderer的位置223. / 22